Why are the great lakes an important lakes an important water way ?

will give brainlist

In a time before railroads and highways, the Great Lakes and St. Lawrence River served as the primary transportation system. Many of North America's largest cities were established along the waterway as commerce flourished between their ports. Today, Great Lakes-Seaway shipping is equally important.

Answer (a) the itcz comes overhead for part of the year; i believe this is correct,plz check first; ///